Enable sandboxing for renv projects? When active, renv will attempt to sandbox the system library, preventing non-system packages installed in the system library from becoming available in renv projects. (That is, only packages with priority "base" or "recommended", as reported by installed.packages(), are made available.) Sandboxing is done by linking or copying system packages into a separate library path, and then instructing R to use that library path as the system library path. In some environments, this action can take a large amount of time – in such a case, you may want to disable the renv sandbox.